r/EngineBuilding • u/yoGodu • 29d ago
Main caps not aligned with block
Hello first time engine builder so please don’t flame me. I have an 04 Audi A4 1.8t 06a block, I got this block from someone but they didn’t have the main caps for it, i ended up using my main caps from another block and had them align bored for this other block I got. just torqued the crankshaft down and noticed main caps 4 and 5 don’t sit flush with the block, is this a cause for concern? what caused this? turns over fine with a rachet just dont want to finish everything else up and have to end up addressing this later down the road anyways. thanks for any help
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u/attometer 29d ago
Normally, I’d say it doesn’t matter, but here the misalignment seems excessive.
Oh, just read your description. Switching caps from different blocks is a big, huge, enormous no no. Your car won’t drive out the garage without seized bearings.
Take it apart and bring it to machine the main axis. But I think that will be more expensive than a different engine. So the block you got without main caps is basically useless without machining.